Noun
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
Source: WordNetAdditionally, francium superoxide (FrO 2 ) is expected to have covalent character, unlike the other alkali metal superoxides, because of bonding contributions from the 6p electrons of francium. Source: Internet
Atomic radii main Atomic number plotted against atomic radius The noble gases, astatine, francium, and all elements heavier than americium were left out as there is no data for them. Source: Internet
Francium superoxide (FrO 2 ) is expected to have a more covalent character than its lighter congeners ; this is attributed to the 6p electrons in francium being more involved in the francium–oxygen bonding. Source: Internet
Bulk francium has never been viewed. Source: Internet
Enough francium is trapped that a video camera can capture the light given off by the atoms as they fluoresce. Source: Internet
Erroneous and incomplete discoveries Soviet chemist D. K. Dobroserdov was the first scientist to claim to have found eka-caesium, or francium. Source: Internet